Covering a total surface area of 3.1 square kilometres (1 sq mi), 2.1 square kilometres (1 sq mi) of this is the central basin with the remainder being composed of saltmarsh and tidal delta. The lagoon is quite shallow and fringed with sedges and paperbarks.
The inlet outflows into the Southern Ocean and is part of the Torbay Inlet and Lake Powell Catchment Area.
Much of the land surrounding the inlet has an elevation of less than 1 metre (3 ft) so that under certain tidal and wind conditions the land is inundated with sea water that floods back up the estuary. As a result, in 1912, a barrage with floodgates was constructed to prevent this, but this proved to be unsuccessful.
A sandbar exists across the mouth of the estuary for most of the year, but it is often breached following significant rain events.
The catchment area is one of the most altered on the South Coast. The inlet drains a large swampland area that includes Lake Powell, Lake Manarup, Five Mile Swamp, Seven Mile Swamp and Marbelup Brook along with a number of man-made agricultural drains.
The area of the catchment is 330 square kilometres (127 sq mi) of which 55% has been cleared and contains 244 kilometres (152 mi) of water ways.
Watershed Torbay was a four-year project which planned and implemented a restoration plan for the Torbay Catchment. The Torbay catchment Group is the community group that formed in 1999 to implement the restoration plan. The activities of the group include establishing and repairing fencing around the waterway, Watsonia control and Wetland construction for nutrient stripping.
- "Estuary Assessment Framework for Non-Prisitine Estuaries - Estuary 896 - Torbay Inlet". 2009. Retrieved 25 April 2009.
- "Inlet Crossings - Bibbulmun Track Foundation". 2009. Retrieved 25 April 2009.
- "South coast Rivercare - Torbay Inlet". 2002. Retrieved 25 April 2009.
- "Torbay Catchment Group". 2007. Retrieved 25 April 2009.
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